Window construction



Dec. 22, 1953 w. MARCUS ,663,055

WINDOW CONSTRUCTION Filed Jan. 9, 1948 5 Sheets-Sheet 1 nvvzwran WILL/4M Marcus Dr /?w wwnaam ATTGRNETJ Dec. 22, 1953 w. MARCUS WINDOW cons'mucnou Filed Jan. 9, 1948 5 Sheets-Sheet 2 T I Q.

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Dr JTTORNE VJ Dec. 22, 1953 w. MARCUS 2,663 05 WINDOW CONSTRUCTION Filed Jan. 9, 1948 5 Sheets-Sheet s I v I 1 INVENTdR vVu. L MM Nana us A TTORNE Y5 Dec. 22, 1953 w. MARCUS WINDOW CONSTRUCTION 5 Sheets-Sheet 4 Filed Jan. 9, 1948 INVENTOR. VV/LLMM Mnncua BY 4W My 2 @m A TTORNE Y5 X IIIIII lfilfbbhUunrbllP I Deg. 22, 1953 w. MARCUS wmnow CONSTRUCTION 5 Sheets-Sheet 5 Filed Jan. 9, 1948' Pia .8 hwr II n 7 IV Illllllly ll INVENTOI? VV/LLMN M n/Was adv-kn. 8 W

A TTQRNEYJ Patented Dec. 22, .1953

UNITED STATES PATENT OFFICE WINDOW CONSTRUCTION William Marcus, Cleveland, Ohio Application January 9, 1948, Serial No. 1,303

1 Claim.

This invention relates to improvements in window construction and more particularly to an arrangement of a double hung window so that the sasnmay be run up and down in the normal manne .but the entire window may be swun into the rooin for cleaning after the manner of a casement window.

This application is a continuation in partof my'copending application Serial Number 725,190, filed Januar'yBO, 1947 for Window Construction, and which'has now been abandoned.

One or the objects of the present invention is to provide a Window of the type described above where substantially all of the window .opening is available for glass portions of the Window whereas prior constructions directed to' this problem have cl sed, a considerable portion of the window opening with heavy frameflconstructions.

Another object of the -present invention is to provide ;a double hungwindo w adapted to be opened into the room as a unit where the only portions of the frame swinging with the window are slidev guides, one for each side of the window.

Another object of the present invention is to connectftwo' sliding sashes and two slide guides in a novel manner so that the entire unit may be swung into the building for cleaning.

' Another object of the present invention is to provide novel means for holding a sliding sash in different positions as it is moved up and down, this holding arrangement being peculiarly adapted to window construction of the type described adapted tio be swung inside a room for cleaning.

Another object of the present invention is the provisionof window construction as described. above'adapted for usewith Venetian blinds and. so arranged as to protect the Venetian blinds when the-entire window is swung into the room after the-manner of a casement window.

Another objectof the invention is the provision of means for swinging a sash into a room for cleaning wherein the sash has a horizontally interlocking and vertically slidable connection with a vertical guide which is hinged to the window frame on one side of the'sash, while at the other side; another verticalsashguide is mounted in the frame for lateral movement toward and away from the sash. .It results from this construction'lIthat when one of the side guides is moved out of engagement with the sash, the sash is swingable about the hinged guide into the room fo'rloleaning and maintenance.

Still another object of the present invention is the provision of a vertically movable sash havinghorizontally interlocking and vertically 'slidahl ail efi ns with aguide which in turn is hinged to the frame. This hinge connection comprises slidable parts permitting the movement of the sash and guide toward the room before the sash and guide are swung about the hinge connection into the room for cleaning and maintenance. This permits the use of my invention in those locations where there is considerable depth in the window frame between the inner wall of the room and the sash. Other ad-:

vantages follow as will later appear in connection with the specification and drawings.

Other objects and advantages of the present invention will be apparent from the accompanying drawings and specifications and the essential features thereof will be set forth in the appended claim.

In the drawings,

Fig. 1 is front elevational view taken from inside a building showing my improved window in closed position;

Fig. 2 is a similar view showing the upper and lower sashes moved respectively downward and upward a smallamount and locked in position ready to be swung into the room for cleaning;

Fig. 3 is an enlarged sectional view taken along the line 3-3 of Fig. 2 and showing in dot-dash lines how the window may be swung about its hinges;

Fig. 4 is a fragmental sectional view taken along the line 4-4 ofFig. 3;

Fig. 5 is a sectional view taken along the line 5-5 of Fig. 6, the position of this view also being shown by the line 5-5 of Fig. 2;

Fig. 6 is a fragmental view taken along the line 6-6 of Fig. 5; 1 Fig. '7 is a fragmental sectional view enlarged of the right-hand portion of Fig. 3 showing the parts as the window starts to swing into the room; I

Fig. 8 is a front elevational view of a modified form of my window construction, this view being taken from inside a building showing the sash in a closed position;

Fig. 9 is a similar view showing the upper and lower sashes of Fig. 8 moved to the proper position for swinging the entire window into the room for cleaning;

. Fig. 10 is an enlarged fragmental sectional view taken along the line I ll-l 0 of Fig. 9;

Fig. 11 is a sectional view enlarged taken along the line ll-H of Fig. 10;

Fig. 12 is a. front elevational view of a window equipped with a modified form of my device, certain parts being broken away to more clearly show the construction;

Fig. 13 is a sectional view enlarged taken along 3 the line Iii-13 of Fig. 12 with portions of the sashes broken away to more clearly show the construction;

Figs. 14 and 15 are enlarged fragmental sectional views taken along similarly numbered lines of Fig. 12; while Fig. 16 is a fragmental perspective view of a vertical side edge of one of the sashes of Figs. 12 to 15 showing a form of sash balance which is used therein and omitting certain corner angles of the sash to more clearly show the construction.

Fig. 17 is a front elevational View of another modification of my window construction. Fig. 18 is an enlarged fragmental sectional view taken. along the line It-Ii of Fig. 1'? with the swinging movement of the sashes indicated in dot-dash lines;

Fig. 19 is a fragmental sectional view taken along the line I9I9 of Fig. 18. Fig. 20 is a perspective view of the hinge and bracket shown in section in Figs. 18 and 19. Fig. 21 is an enlarged fragmental sectional view taken along the line 2I2I of Fig. 17; while Fig. 22 is a view similar to Fig. 21 showing the position of the parts necessary'to swing the sashes into the room.

The double hung sash window is a very popular type, but has the known disadvantage that it is difiioult to clean without going outside the building. Many structures have been suggested to cure this difiiculty but, to the best of my knowledge, they have been unsuited to the purpose either because they were too complicated or because they used heavy framework which occupied much of the window opening, thus cutting down the available glass area. My invention avoids both of these difficulties by providing parallel slide guides I and I I along opposite sidesof the window. The lower sash I2 and the upper sash I3 have their vertical sides dovetailed into, the guides I0 and II, as clearly shown in Fig. 3. Thus, the members Ill, II, I2 and I3 are tied together in a horizontal direction. The guide H) is mounted by hinges It on the frame I which is a fixed portion of the building. The guide I I,,

when the window is closed, is locked to the frame I5 by means of locking bolts I6 which are manipulated by means of a vertical rod mounted on the guide II. in their uppermost position, as shown in Fig. 2, they enter into notched openings I8 in the casement frame. They then slide downwardly into pockets I9 arranged to retain the bolts. In this closed position of the window the upper and lower sashes move freely up' anddown in the guides l0 and l I in the manner of a double hung sash window.

When it is desired to open the window into the room for the purpose of cleaning the outer face of the glass the lower sash is moved upward slightly from the position of Fig. 1 (where the lower edge is indicated at I2a) to the position of Fig. 2 where the lower edge 12a will clear the window sill 29. At the same time, the upper sash I3 is moved downwardly from the position of Fig. 1 (where the upper edge is indicated at I3a) to the position of Fig. 2 where the edge I3a clears the portion I5a of the casement frame. In this position of the parts, the sashes I2 and I3 are locked to each other and to the guides l0 and II against relative vertical movement. Any suitable locking means may be utilized for this purpose. In Figs. 1, 2 and 3, I have shown lock bolts 21 on opposite sides of the window. each bolt I1 slidably When the bolts are being slidably mounted by a pin and slot construction 22 upon a base plate 23 which is secured to the lower sash. Each bolt has a looking nose Zia which enters into a suitable notch in the side guide ID or II. Each bolt also has a locking nose 2Ib which enters into a notch I3?) in the frame of the upper sash. Obviously, when these bolts are in the position shown in Fig. 3, the" lower sash" l2 cannottmoveup and. down because of thev engagement of the locking noses 2 la in the guides I 0 and II. Also, the sash l3 cannot move relative to the other parts because of the engagement of the locking noses 2Ib in the notches" l3b. It will be noted in Fig. 2 that the vertical. rod 1:! has been moved upwardly from the position shown in Fig. 1 so that the bolts I5 are in'registration with the notches I8. The window'is now in position to be swung into the room about the hinges I4 and such movement is indicated inthe dot-dash lines of Fig. 3.

Preferably, I provide means for insuring proper positioning of? the sash and guide unit when the window is closed. For, this purpose, near the upper portionof' the guide I I I have struck outwardly a tongue 2t from, eachwof' the flat guide faces I'Ia. In the easement. frame I have secured two brackets25, each of which has a projection. 25a upon which one of the tongues 24 is adapted to rest. There may be a slight incline on the tongue or the projection 25a so that the parts will enter into the proper position easily. Referring to Fig. '7, it will be noted that these parts are so arranged that as the corner 26 ofv the guide I l moves away from the stop 2.! along. the path of the dot-dash line 28 it will clear the projection 25a.

Preferably, means is provided for sealing the guides l9 and II against air leakage. The means here shown comprises'strips 29. and 30 in the guides I0 and. II respectively, eachstrip running the full length of' the window. I These strips are readily held in the dovetail pockets 3| and 32 which are provided in the guides between the sash-receiving dovetails. These. sealing strips 29 and 30 engage the casement frame I5 when the window is closed.

Preferably, a flange lI-b (Fig. 3) is provided along the entire length. of the guide I l on the inside face thereof extending away from the window and engaging a shoulder 15b in the casement frame. This closes the crack extending in a vertical direction which isnecessarily provided for the swinging movement of the window.

It should be understood by those skilledin this art that a very acceptable window might be pro vided wherein one of the sashes, for instance the upper sash I 3, might be fixed in the guides I0 and i i leaving only the lower sash I2 slidable. In such a case, the portion of the guides holding the upper pane of glass might be simplified over the construction shown'but. such modification will readily occur to those skilled-in this art and need not be further'described here.

In Figs. 5 and 6, I have shown a novel means for holding one of the sliding sashes in approximately any position to which it, is raised. This means is shown in detail in Figs. 5 and 6, as the same would be applied'to the lower left-hand'portion of the sash I2, as indicated in dotted lines in Fig. 2. The same structure might be applied to the upper sash, as is indicated in dotted lines in the upper left-hand corner of the sash I3 in Fig. 2.

In Figs. 5 and 6, I have showna bracket 33 secured in a. chamber opening 34 f the sash i2.

81 This bracket has downturnedend pieces 33a in? which a shaft 35 is rotatablymounted. The outer end of this shaft carries a gear 36 beveled to conform to a wall Inc of the guide 10. Arranged vertically in this wall Ihave. punched openings [b providing a rack to coact with the. teeth of the gear 36 as the window sash is 'moved. up and down. A helical compression spring 31 surrounds shaft 35'and is-confined between one of thebracket ends 33a and a follower 39 which has an opening whereby it rideson the'shaft. The follower has a projection 33a which rides ina sinuous groove 39 extending around the shaft 35. It results from this construction that as the sash i2 is moved up and down-the gear 36 travels along the fixed rack lilb soas to rotate shaft.35. The groove 39 causes the follower38 to move from its position farther toward the left, as viewed in Fig. 6 to a position farther toward the right when that portion of thegroove 39 comes around. As the follower 38 moves toward the right, as viewed in Figs. and 6, itcornpresses spring 31. When the operator releases the sash I 2, the follower will move along the groove, 39 to the nearest position corresponding to that shown in Fig. 6. At this point, the sash will remain stationary becausethe parts are so constructed and arranged that the weightof the sash acting to turn the shaft 35 is-inefiective to cause the projection 38a to travel along the groove 39 in a direction to compress spring 31. The friction resisting this movement of the projection 38a. along the groove 39 is toogreat, and the sash remains in the position to which it has been raised. 7 1 p Y In the modification shown in Figs. 8 to -11 in-v clusive, I have provided means to protectVenetian blinds in case they are used. Here thecasement opening is shown at 4B and mounted, in the upperportion thereof is a bracket 4| from whichhangs the Venetian blind 42 in the custgmary manner. In this form of'my device the lower sash 43' and the upper sash 45 are pro-' vided with dovetailed edges which are vertically slidable inthe parallel slide guides l9" and H which are exactly like those shown at H! and H in the first described form except that they are cut off at the point 45 for the purposeof protecting the Venetian blinds. A slide portion i9" is directly alined above the member 43 and a portion H is vertically alined above the slide guide H. As clearly shown in Fig. 11, the slide guide'portions l0" and H are fixed to the casement 40- by means of screws 45. Suitable spacing members 41 and 48 are supplied between the guides H)" and II" and the casement Mi'where necessary to maintain proper vertical alinement. The usual bayonet lock 48 is provided to lock the upper and lower sashes together when both sashes are closed. Sliding bolts 49 are secured to the lower sash 43 and adapted to extend into suitable slots 49a in the central portion .of the slide guides I0 and II as illustrated in Fig. 10 when the lower sash is raised slightly as shown in Fig. 9. A locking member. 5!], is pivotally mounted at 5| on the slide guide 1 I andadapted to swing to unlocked position as shown in Fig. 9 or to locked position as shown in Fig. 8 where the locking member 50a engages in a pocket :52 in. the casement 40-. a

Preferably, the upper edges of both sashes are beveled as indicated in Fig. -11 at 48a and; 44a for a. purpose later described.

Holding devices are indicated for the lower sash at 53 and for the upper sash at 54,. These are like the holding members described in connection with-Figs. 5 and6 and are provided for the same purpose. 1

The operation of this modified form of my device should now be apparent. When the parts are in the position of Fig: 8 the slide guides IB' and I I are in fixed position relative to the casement 40 due to the 1ock'50 and the inter-relationship between the sashes and the slide guides. When it is desired to swing the entire window into the room for cleaning it is necessary to raise the lower sash slightly as shown in Fig. 9 and to engage the slide bolts 49 into the slots 49a. It is also necessary to lower the upper sash to the position shown in Fig. 9 so that. the upper portion of this sash will clear the fixed slide guide por tions 0" and II". If the Venetian blind 42 is in its usual raised position, then the position of the uppersash as shown in Fig. 9 will clear this blind. The latch 50a is then swung to unlocked position as shown in Fig. 9 and the upper and lower sashes'together with the slide guides 99' and H maybe swung into the room about the hinges 55. The upper sash 4s may then be moved relative to the lower. sash 43 if desired during the washing process. During this manipulation of the sash it may be held in various positions by suitable means'not shown and forming no part of the present invention. When the cleaning operation is completed the parts are swung back tothe position of Fig. 9, the latch portion 58a isagain engaged in the pocket 52 and the bolts 69 are withdrawn to the position of Fig. 8. Both of the sashes may now be manipulated up and down in the usual manner and the movement of either sash from the slide guides 19' and l I upwardly into the fixed portions Ill" and H" respectively, is facilitated by the beveled edges 13a and 44a. on the lower and upper sashes. respectively. i

It should be obvious from this description that it is impossible to swing the entire window into the room until the upper sash 44 is moved downwardly out of the yfixed slide. guide portions l0" and It". Thus, the Venetian blinds are always protected against damage.

In Figs. .12 to 16 I have shown another modiiication of my device for accomplishing the same purpos as disclosed in Figs..8 to 11 inclusive. Here a-fixed frame 56 is provided as in the previous form of my device and two parallel side guides- 51 and 58 extend along'the vertical parallel sides of the frame 56. The guides 51 and 58 are the same except for minor details .of attachv mentIand therefore one only will be described. In

Figs. .13, 14 and15it will be noted that each of the guides provides a pair of channel form members '59 for the upper sash and 6|] for the lower sash joined together by a central web St. The channel 59 for instance has a central web portion 59a and edge flanges 59bwhich are so spaced as to slidingly receive the upper sash 62. To the mid portion of 59a of the channel 59 is secured a stiff metallic strip 59c extendi enerally parallelto the web fiflwand stopping short of'the flanges 59bt'o' form free edges 59d. L-shape angular members 64 are secured to the vertically extending corners of sash62 a portion of one of these angularmembers being shown in perspective'inv Fig. 16 These angular members '64 embrace the free edges 59d of the strip 5915 so that thesash 62 is interlocked horizontally with the guide channel portion 59 but is vertically slidable her in. The ow r. as fii s m l ys port acne-ions and. connected in the guide channel" portion 80 by means of the angular corner. members: 64'.

As in the form of my invention shown in Figs. 8 to: 11 inclusive, I. here. provide means: for compelling the lowering of the sash 62 to a. point beneath the lower edge of the Venetian. blinds 65 before the window can be swung into the room. To this end, the uppermost portion of. each side guide as indicated at 51a and 58a is fixed to the easement 56. The intermediate portions and 58 of the side guides areadapted to be. moved out of the frame 56 by the securingof the side guide portion 51 to the frame 56 by means of the hinges:

the guide portion 51a shown in Fig. 14= is similarin all respects to the fixed guide portion 51 shown in Fig. except for the manner of fastening the same to the frame 56 and sealing the same against the entry of undesirable weather efiects.

Referring first to Fig. 15, I-have here provided a.

resilient sealing strip 61 extending continuously from top to bottom of the guide portion 51' and held between the flanges 59b, 60b and the web 6 LV The strip 61 engages the fram 56 when the win.- dow is closed so as to provide a weather tight seal entirely along the guide portion 51. It shouldbe understood that a similar sealing strip is provided at the opposite edge along the guide portion 58.

Referring now to Fig. 14, a flexible pad or sheet 68 extending the full vertical length of the guide portion 51a is inserted between the web 59a and the frame. frame 55 and are so arranged that the guide portion 59 can move slightly toward and'away from the frame 56. A similar resilient pad 68' is secured between the channel portion 60 and the fram 56. The edges of'the-sashes 62 and 63 are beveled as indicated at 620. and 6311. It results from this construction that, when the window'is not swung into the room, as one of the sashes moves from the movable portion of the side guide 51 or 58 into the fixed portion 51a or 58a respectively, the resilient cushions 68 and 68' permit the side guide to move slightly to accommodate itself to the width of the sash in case the same:

varies slightly from standard dimensions. Referring to Fig. 13, I hav indicated in dotted lines at 16 and Hi similar resilient cushions behind the fixed guide portion 58a.

Referring to Fig. 13, a fixed portion 58a of the side guide is secured to frame 56 by'means of screws H and back of the side guide are resilient cushioning members 12 and 12 for the purpose of providing a slight movement of the fixed guide.

portion laterally to accommodate itself to the width of th sash. The sash 63 is indicated as beveled at 631) for the purpose of causing the entry of the sash more easily into the fixed portion 580.

Another advantage of the resilientcushions such as 68, 68', 10,10 and so forth, is that they provide weather sealing strips along the fixed portion of the side guides. Since the strip 61 forms a weather seal along the movable portion of the sid guide, it will be seen that my entire window is weather sealed along both of the vertical side edges thereof.

Another advantage of the fixed and movable side guide portions is that it compels the operator to move the upper sash 62 below the parting Screws 69 secure the web 59a to the line. I: before the sashes can be swung into the room and this protectsthe Venetian; blind against damage. At the sam time it compels the raising'of the lower sash 63 above the parting line 14 so as to be sure that the lower sash will clear the sill 15 before it is attempted to swing the window into-the room.

The usualbayonet lock 16 and Ilia. is provided between the upper and lower sashes. Fixed to the upper rail of the lower sash 63 are sliding bolts 49' which enter into the sid guides forthe purpose of fixingthe sashes in the position of Fig. 12 before the sashes and side guide portions 51 and 58 areswungout intothe room. These perform thesame functions as the bolts 49*previously described.

In Figs. 12 to 16 I have shown another means for counterweighting the slidable sashes. This comprises the sash balance 1'! which is fully disclosed and described inthe United States Patent No. 2,230,763 granted: February 4, 1941 to Albert J. Rosentreter, to which reference may be made for a more complete description.

In the modification of myinvention shown in Figs. 17 to 22, inclusive, two new features are shown. The first of these involves the use of a vertical guide on the side of the sash away from the hinged guide which is movable laterally relative to the frame to free the sash for swinging movement into the room. The other novel feature is the special hinge connection clearly shown in Fig. 20. It'should be understood that either of these modifications may be utilized not necessarily in company with the other but either of these modifications may be utilized in connection with previously described forms of my invention.

Referring now to Fig. 17, a fixed frame 16 is provided as in previous forms of my invention. In this frame are slidably mounted an upper sash l9 and a lower sash 80. On the left-hand side of the frame I8, as viewed in Figure 1'7, a vertical guide is provided having an upper portion 8| which is fixed the same as in Fig. 12, and having a lower portion 82 which has a horizontally interlocking and vertically slidable connection with the upper and lower sashes, this connection being exactly the same as described in connection with Fig. 14. For each sash the vertical guide 82 supports a vertically extending plate 83 behind which are received the angle members 84 which in turn are secured to each sash. It results from this construction that each sash is verticallyslidable in the guide 82 but is horizontally interlocked so that the sash cannot fall out of the guide. Sash counterbalancing members 85 are provided exactly'like the member H shown and described in connection with Fig. 16.

On the right hand side of the frame 18, as viewed in Fig. 17, a vertical uide 86 is provided having grooves or channels 86a and 86b for slidably receiving the upper and lower sashes, respectively. Means is provided for moving this guide 86 laterally with respect to the fixed frame 18. In the present instance, this means comprises a pluralit of screws 8! passin through a central portion of the guide 86 as clearly shown in Figs. 21 and 22. Each of the screws 81 is rotatably mounted but axially fixed in the guide 86 by means of plate 88 which enter into a suitable groove 89 in the screw. The free end of the screw has a threaded connection with a plate 96 which is fixed to the frame 18. It results from this construction that in the normal position of the parts as shown in Fig. 21 the guide 86 is moved away from the frame 81 by'means of the screws 81 so that it engages and holds the sashes 19 and 80 but in position to permit these sashes to be moved up and down vertically in the normal manner of a double hung window. When it is desired to swing the sashes into the room, the screws 81 are turned until the guide 86 occupies the position of Fig. 22 where the guide 86 is moved clear of the upper and lower sashes. Access may be had to the lower screw 81, as viewed in Fig. 17, by raising the lower sash'a small amount.

By the use of the modification of my invention just described, the sashes 19 and 80 and the guide 82 may be swung as a unit into the room for cleaning or maintenance of the windows. The free edges of the sashes l9 and 80 need not be permanently encased in a side guide but instead the guide 86 may remain in the position shown in Fig. 22 secured to the frame 78.

The second modification mentioned above as including the hinge shown in Fig. 20 is provided for the purpose of moving the sashes as a unit toward the room before swingin the same about the vertical pivot of the hinge connection. This is desirable for the purpose of reducing the clearance necessary between the swinging edges of the sash and the fixed frame. It is also valuable in those cases where the frame is of considerable depth from the wall of the room to the sash of the window. In such cases it is desirable to move the entire window including the two sashes and the hinged guide 82 in a horizontal direction into the room until the hinge pivot has cleared the fixed frame. Then the entire unit may be swung about the hinge pivot into the room. The construction shown in Figs. 18, 19, and 20 is applied to both of the hinges 9| shown in Fig. 17. Each hinge comprises a leaf 91a which is secured to the guide 82 and a leaf 9lb which is slidably mounted in a bracket 92 which is secured by flanges 92a to the frame 18. As clearly shown in Figs. 18 and 19 the bracket 92 is recessed into the frame 18 so that the outer faces of the flanges 92a are flush with the inner face of the frame 18 which meets the guide 82. It will be noted in Fig. 20 that the bracket has lips 921) which overlie the hinge leaf 9lb so as to hold the same in position as it slides back and forth. Means is provided for limiting the movement of the hinge back and forth. In the present instance a pin 93 is fixed to the bracket 92 and extends through a'slot 94 in the hinge leaf 9lb.

It results from this improved hinge construction that when the window is to be opened, it is moved from the full line position of Fig. 18 to the dot-dash line by sliding the hinge leaf 9") in the bracket 92. Thereafter the sashes are moved together with the vertical guide 82 about the hinge 9|.

It should be clearly understood that I may use my improved hinge, as shown in Fig. 20, with the specific form of vertical guide shown in Figs. 3, 10 and 11, or with the specific form of vertical guide shown in Figs. 14 and 15.

What I claim is:

In window construction, the combination consisting solely of a fixed frame having parallel vertical sides, two parallel vertically extending guides each providing inner and outer vertical runways, two vertically movable sashes, one sash in each of said runways, said sashes having horizontally interlocking and vertically slidable connections with each of said guides, said horizontally interlocking connections being capable of endwise slidable assembly of said sash on said guides, each of said guides having an intermediate portion movable relative to said frame and having top and bottom portions fixed relative to said frame, said intermediate portions of said guides being longer than the height of one sash, and means mounting said sashes and said two movable guide portions as a unit for movement out of said frame.

WILLIAM MARCUS.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 178,990 Brown June 20, 1876 375,000 Roger Dec. 20, 1887. 528,733 McKenzie Nov. 6, 1894 570,948 Neuens Nov. 10, 1896 606,448 Corbin June 28, 1898 607,427 Duval July 19, 1898 639,866 Romuender Dec. 26, 1899 642,239 Marx Jan. 30, 1900 700,956 Lorenz May 27, 1902 742,869 Hayes Nov. 3, 1903 782,743 Fischer Feb. 14, 1905 999,318 Kopp Aug. 1, 1911 1,059,476 Lehmann Apr. 22, 1913 1,389,136 Hutchinson Aug. 30, 1921 1,643,142 Whipps Sept. 20, 1927 1,682,669 Freeland Aug. 28, 1928 1,839,353 Smith Jan. 5, 1932 2,018,308 Johnson Oct. 22, 1935 2,181,215 Sweany Nov. 28, 1939 2,344,877 Janigian Mar. 21, 1944 2,396,295 Spraragen Mar. 12, 1946 2,571,677 Burke Oct. 16, 1951 2,576,539 Rundquist Nov. 27, 1951 FOREIGN PATENTS Number Country Date 13,810 Great Britain 1 94 

